its bonds scripts that have the error and charge you attack once then freeze. its mentioned in the apoc thread but not on the modelpack where you buy which is a bit wrong. it should say this like it does on the theatre pack, and dark ai is not a patch on the bond script they merely side step lots and do not animate as would want.
in other words put in dark ai and they will work.
on map editor right click on one zombie, in the main ai script change it from bond browse and goto people then insert dark ai. apply
then they will work but not like the intended scripts, they will dance around and be more tactical than a zombie should be, and not attacking.
or replace the script with the slower zombies script and just speed up the character in the fpe script.
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